blob: 2af1d0c52bcdda6d4960c941099c2eac1c05e85e [file] [log] [blame]
Javier Martinez Canillas4065d1e2012-01-31 00:18:00 -08001/*
2 * Source for:
3 * Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver.
4 * For use with Cypress Txx3xx parts.
5 * Supported parts include:
6 * CY8CTST341
7 * CY8CTMA340
8 *
9 * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
10 * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * version 2, and only version 2, as published by the
15 * Free Software Foundation.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License along
23 * with this program; if not, write to the Free Software Foundation, Inc.,
24 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
25 *
26 * Contact Cypress Semiconductor at www.cypress.com <kev@cypress.com>
27 *
28 */
29
30#include "cyttsp_core.h"
31
32#include <linux/i2c.h>
33#include <linux/input.h>
34
35#define CY_I2C_DATA_SIZE 128
36
37static int cyttsp_i2c_read_block_data(struct cyttsp *ts,
38 u8 addr, u8 length, void *values)
39{
40 struct i2c_client *client = to_i2c_client(ts->dev);
41 struct i2c_msg msgs[] = {
42 {
43 .addr = client->addr,
44 .flags = 0,
45 .len = 1,
46 .buf = &addr,
47 },
48 {
49 .addr = client->addr,
50 .flags = I2C_M_RD,
51 .len = length,
52 .buf = values,
53 },
54 };
55 int retval;
56
57 retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
58 if (retval < 0)
59 return retval;
60
61 return retval != ARRAY_SIZE(msgs) ? -EIO : 0;
62}
63
64static int cyttsp_i2c_write_block_data(struct cyttsp *ts,
65 u8 addr, u8 length, const void *values)
66{
67 struct i2c_client *client = to_i2c_client(ts->dev);
68 int retval;
69
70 ts->xfer_buf[0] = addr;
71 memcpy(&ts->xfer_buf[1], values, length);
72
73 retval = i2c_master_send(client, ts->xfer_buf, length + 1);
74
75 return retval < 0 ? retval : 0;
76}
77
78static const struct cyttsp_bus_ops cyttsp_i2c_bus_ops = {
79 .bustype = BUS_I2C,
80 .write = cyttsp_i2c_write_block_data,
81 .read = cyttsp_i2c_read_block_data,
82};
83
84static int __devinit cyttsp_i2c_probe(struct i2c_client *client,
85 const struct i2c_device_id *id)
86{
87 struct cyttsp *ts;
88
89 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
90 dev_err(&client->dev, "I2C functionality not Supported\n");
91 return -EIO;
92 }
93
94 ts = cyttsp_probe(&cyttsp_i2c_bus_ops, &client->dev, client->irq,
95 CY_I2C_DATA_SIZE);
96
97 if (IS_ERR(ts))
98 return PTR_ERR(ts);
99
100 i2c_set_clientdata(client, ts);
101
102 return 0;
103}
104
105static int __devexit cyttsp_i2c_remove(struct i2c_client *client)
106{
107 struct cyttsp *ts = i2c_get_clientdata(client);
108
109 cyttsp_remove(ts);
110
111 return 0;
112}
113
114static const struct i2c_device_id cyttsp_i2c_id[] = {
115 { CY_I2C_NAME, 0 },
116 { }
117};
118MODULE_DEVICE_TABLE(i2c, cyttsp_i2c_id);
119
120static struct i2c_driver cyttsp_i2c_driver = {
121 .driver = {
122 .name = CY_I2C_NAME,
123 .owner = THIS_MODULE,
124 .pm = &cyttsp_pm_ops,
125 },
126 .probe = cyttsp_i2c_probe,
127 .remove = __devexit_p(cyttsp_i2c_remove),
128 .id_table = cyttsp_i2c_id,
129};
130
Dmitry Torokhov4a533832012-03-16 23:05:44 -0700131module_i2c_driver(cyttsp_i2c_driver);
Javier Martinez Canillas4065d1e2012-01-31 00:18:00 -0800132
133MODULE_LICENSE("GPL");
134MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) I2C driver");
135MODULE_AUTHOR("Cypress");
136MODULE_ALIAS("i2c:cyttsp");